I think the Weapons Guild site has some pic's of a build. You'll have to dig though. There are people who have built them here but getting pictures might be hard. I'de also say skip
the weld idea, and pin the carrier to the bolt.

I bored the hole for accessing the firing pin retainer with a couple .125 endmills. I started from the bottom side with a ball endmill. Once through into the recoil spring tube, I switched to a standard square end cutter to deal with the curved surface on the inside of the tube. A drill bit will just follow the curve inside the tube and break.

My last post in that thread has links to the rest of the build.

A LOT of people have done 9mm and 7.62x25 builds, so there is a pretty decent amount of info available. There is even a complete 9mm/7.62x25 carrier available (I think from erieordnance), but I have no info about it.

As mentioned, check Weapons Guild, and the following link for some of the Gunco threads: